Gamma Knife
Safety and Effectiveness
The efficiency and safety of the Gamma Knife are well established
and documented. More than 150,000 patients have received Gamma Knife
treatment at sites worldwide. Most types of tumors show response
in 85 to 98 percent of cases. In 75 to 80 percent of patients, arteriovenous
malformations (AVMs) treated with Gamma Knife radiosurgery disappear
completely within two years of treatment.
The Gamma Knife treatment rarely causes side effects and there
is no risk of surgical complications such as infection, hemorrhage
or leakage of cerebral spinal fluid.
The Gamma Knife has been used most effectively to treat small to
medium-size (less than 3 centimeters or 1.25 inches) brain tumors
and AVMs, although it can be used for larger targets. It is also
used to treat residual lesions, diseased tissue that cannot be removed
by conventional surgery, and recurring tumors.
What should patients expect? 
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